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【单选题】
某种物质的已烷溶液的紫外光谱,有个吸收带在 305 nm ,但在乙醇溶液中这个吸收带移到 307 nm ,该吸收带是由下面哪一种类型跃迁引起 ?A.
σ → σ*
B.
n → σ*
C.
n → π*
D.
π → π*
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反馈参考答案：
举一反三
【单选题】Giving a part of project work to a contractor is an example of:
A.
risk mitigation
B.
risk assignment
C.
risk delegation
D.
risk deflection
E.
risk assumption
【单选题】He__________ the students a few books to read．
A.
arranged
B.
managed
C.
assigned
D.
appointed
【单选题】John Smith, a diligent student, never refuses to______more responsibilities that are assigned to him.
A.
take in
B.
take up
C.
take on
D.
take off
【单选题】卡比多巴治疗帕金森病时可
A.
提高多巴脱羧酶活性,使外周左旋多巴转变成多巴胺增加
B.
提高多巴脱羧酶活性,使中枢左旋多巴转变成多巴胺增加
C.
抑制多巴脱羧酶活性,使外周左旋多巴转变成多巴胺减少
D.
抑制多巴脱羧酶活性,使中枢左旋多巴转变成多巴胺减少
E.
不影响多巴脱羧酶活性
【单选题】The school has been ______ as the meeting place for the evening art club.
A.
designed
B.
assigned
C.
designated
D.
registered
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